feat: add ability to set envs to override config directories (#1661)

README.md

@@ -232,6 +232,11 @@ $HOME/.local/share/crush/crush.json
 %LOCALAPPDATA%\crush\crush.json
 ```
 
+> [!TIP]
+> You can override the user and data config locations by setting:
+> * `CRUSH_GLOBAL_CONFIG`
+> * `CRUSH_GLOBAL_DATA`
+
 ### LSPs
 
 Crush can use LSPs for additional context to help inform its decisions, just

internal/config/load.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"cmp"
 	"context"
 	"encoding/json"
 	"fmt"
@@ -695,19 +696,22 @@ func hasAWSCredentials(env env.Env) bool {
 
 // GlobalConfig returns the global configuration file path for the application.
 func GlobalConfig() string {
-	xdgConfigHome := os.Getenv("XDG_CONFIG_HOME")
-	if xdgConfigHome != "" {
+	if crushGlobal := os.Getenv("CRUSH_GLOBAL_CONFIG"); crushGlobal != "" {
+		return filepath.Join(crushGlobal, fmt.Sprintf("%s.json", appName))
+	}
+	if xdgConfigHome := os.Getenv("XDG_CONFIG_HOME"); xdgConfigHome != "" {
 		return filepath.Join(xdgConfigHome, appName, fmt.Sprintf("%s.json", appName))
 	}
-
 	return filepath.Join(home.Dir(), ".config", appName, fmt.Sprintf("%s.json", appName))
 }
 
 // GlobalConfigData returns the path to the main data directory for the application.
 // this config is used when the app overrides configurations instead of updating the global config.
 func GlobalConfigData() string {
-	xdgDataHome := os.Getenv("XDG_DATA_HOME")
-	if xdgDataHome != "" {
+	if crushData := os.Getenv("CRUSH_GLOBAL_DATA"); crushData != "" {
+		return filepath.Join(crushData, fmt.Sprintf("%s.json", appName))
+	}
+	if xdgDataHome := os.Getenv("XDG_DATA_HOME"); xdgDataHome != "" {
 		return filepath.Join(xdgDataHome, appName, fmt.Sprintf("%s.json", appName))
 	}
 
@@ -715,10 +719,10 @@ func GlobalConfigData() string {
 	// for windows, it should be in `%LOCALAPPDATA%/crush/`
 	// for linux and macOS, it should be in `$HOME/.local/share/crush/`
 	if runtime.GOOS == "windows" {
-		localAppData := os.Getenv("LOCALAPPDATA")
-		if localAppData == "" {
-			localAppData = filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local")
-		}
+		localAppData := cmp.Or(
+			os.Getenv("LOCALAPPDATA"),
+			filepath.Join(os.Getenv("USERPROFILE"), "AppData", "Local"),
+		)
 		return filepath.Join(localAppData, appName, fmt.Sprintf("%s.json", appName))
 	}